slock — simple X screen locker

slock  can  be  customized  by  creating a custom config.h from config.def.h and (re)compiling the source
       code. This keeps it fast, secure and simple.

                                                   2016-08-23                                           SLOCK(1)

slock  is  a  simple  X  screen  locker. If provided, cmd [arg...] is executed after the screen has been
       locked.

       $ slock /usr/sbin/s2ram

       slock — simple X screen locker

-v      Print version information to stdout and exit.

       To make sure a locked screen can not  be  bypassed  by  switching  VTs  or  killing  the  X  server  with
       Ctrl+Alt+Backspace, it is recommended to disable both in xorg.conf(5) for maximum security:

       Section "ServerFlags"
               Option "DontVTSwitch" "True"
               Option "DontZap"      "True"
       EndSection

slock [-v] [cmd [arg...]]